html,body {
  height: 100%;
  width: 100%
}
* {
  font-size: .24rem;
  margin: 0;
  padding: 0
}
.flex {
  display: flex;
  align-items: center;
  justify-content: space-around;
}
.flexStart {
  display: flex;
  align-items: center;
  justify-content: flex-start;
}
.flexCenter {
  display: flex;
  align-items: center;
  justify-content: center;
}